I recently got a colt 1911 pistol for my birthday. (Sometimes younger brothers can be pretty cool). Anyway, I downloaded the owner's manual from Colt and disassembled it following the instructions as best as I could. However, after I put it back together, (again following the instructions) I noticed that when the slide is locked back, the barrel moves side to side ever so slightly, it's not much, but I can tell it does move. Is this normal or did I screw something up?